Three concentric metallic spherical shells of radii \( R, 2 R, 3 R \), are given charges \( Q_{1... VIDEO
Three concentric metallic spherical shells of radii \( R, 2 R, 3 R \), are given charges \( Q_{1}, Q_{2}, Q_{3} \), respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, \( Q_{1}: Q_{2}: Q_{3} \), is
[IIT-JEE 2009]
(a) \( 1: 2: 3 \)
(b) \( 1: 3: 5 \)
(c) \( 1: 4: 9 \)
(d) \( 1: 8: 18 \)
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